Fix ram-boot handling of 64-bit addresses

Hex vs. decimal thinko

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
diff --git a/board-qemu/slof/OF.fs b/board-qemu/slof/OF.fs
index 504e763..29003e3 100644
--- a/board-qemu/slof/OF.fs
+++ b/board-qemu/slof/OF.fs
@@ -235,8 +235,8 @@
         decode-int -rot decode-int -rot ( n1 n2 p s )
 	decode-int -rot decode-int -rot ( n1 n2 n3 n4 p s )
 	2drop
-	swap 32 << or to direct-ram-boot-size
-	swap 32 << or to direct-ram-boot-base
+	swap 20 << or to direct-ram-boot-size
+	swap 20 << or to direct-ram-boot-base
 	." Detected RAM kernel at " direct-ram-boot-base .
 	." (" direct-ram-boot-size . ." bytes) "
 	\ Override the boot-command word without touching the